Armchair



FIG. 1 is a front perspective view of an armchair showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left side elevation view, the opposite side being a mirror image thereof;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a top plan view thereof. 

CLAIM The ornamental design for an armchair, as shown and described. 